[PATCH] usb: phy: generic: Handle late registration of gadget

From: Maarten ter Huurne
Date: Sun Feb 28 2016 - 10:34:41 EST


It is possible for the VBUS detect GPIO interrupt to occur before
nop_set_peripheral() is called, in which case otg->gadget is NULL.

Signed-off-by: Maarten ter Huurne <maarten@xxxxxxxxxxxxxx>
---
drivers/usb/phy/phy-generic.c | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/phy/phy-generic.c b/drivers/usb/phy/phy-generic.c
index 5320cb8..980c9de 100644
--- a/drivers/usb/phy/phy-generic.c
+++ b/drivers/usb/phy/phy-generic.c
@@ -118,7 +118,8 @@ static irqreturn_t nop_gpio_vbus_thread(int irq, void *data)
status = USB_EVENT_VBUS;
otg->state = OTG_STATE_B_PERIPHERAL;
nop->phy.last_event = status;
- usb_gadget_vbus_connect(otg->gadget);
+ if (otg->gadget)
+ usb_gadget_vbus_connect(otg->gadget);

/* drawing a "unit load" is *always* OK, except for OTG */
nop_set_vbus_draw(nop, 100);
@@ -128,7 +129,8 @@ static irqreturn_t nop_gpio_vbus_thread(int irq, void *data)
} else {
nop_set_vbus_draw(nop, 0);

- usb_gadget_vbus_disconnect(otg->gadget);
+ if (otg->gadget)
+ usb_gadget_vbus_disconnect(otg->gadget);
status = USB_EVENT_NONE;
otg->state = OTG_STATE_B_IDLE;
nop->phy.last_event = status;
@@ -184,7 +186,10 @@ static int nop_set_peripheral(struct usb_otg *otg, struct usb_gadget *gadget)
}

otg->gadget = gadget;
- otg->state = OTG_STATE_B_IDLE;
+ if (otg->state == OTG_STATE_B_PERIPHERAL)
+ usb_gadget_vbus_connect(gadget);
+ else
+ otg->state = OTG_STATE_B_IDLE;
return 0;
}

--
2.6.2